Artur Jorge, former Portugal and European Cup-winning Porto coach, died at 78.
Jorge guided Porto to their first continental trophy, a 2-1 triumph over Bayern Munich in the 1987 European Cup final in Vienna.
He also won seven Portuguese league titles, four as a player with Benfica and three as Porto manager, before managing Paris Saint-Germain to their second French top-flight victory in 1994.
"It is with deep sadness that the family of Artur Jorge Braga de Melo Teixeira announces his death this morning in Lisbon following a long illness," his family said in a statement reported by Portuguese media.
Jorge, who came through the Porto youth system but only played a few games for the senior squad, became the club's head coach in 1984.
He left after winning the European Cup but returned in 1989 to win his third league title.
"His death leaves Porto FC without a legend," the team announced.
Jorge was in command of the Portuguese national team twice, from 1990 to 1991 while simultaneously coaching Porto, and then again from 1996 to 1997.
He was Switzerland's manager during Euro 1996 and later coached Cameroon, which failed to qualify for the 2006 World Cup.
After spending two years in charge of Racing Paris, Jorge will be remembered warmly in Paris for leading PSG to league and French Cup titles.
"Artur Jorge is the greatest coach I have known," said former PSG president Michel Denisot.
"Educated, cultured, passionate, strategic, uncompromising... with him PSG grew very quickly."